1 files changed, 1 insertions, 0 deletions

diff --git a/lisp/mouse-drag.el b/lisp/mouse-drag.el
index f8196c75de3..3f41d9f18fd 100644
--- a/lisp/mouse-drag.el
+++ b/lisp/mouse-drag.el
@@ -205,6 +205,7 @@ To test this function, evaluate:
          col mouse-col-delta window-last-col
          (scroll-col-delta 0)
          adjusted-mouse-col-delta
+         adjusted-mouse-delta
          ;; be conservative about allowing horizontal scrolling
          (col-scrolling-p (mouse-drag-should-do-col-scrolling)))
     (select-window start-window)